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...t; How do I get around this? I cannot use arima() because I need the flexibility of "lag" from arma(), unless there's a way to include lag in arima(). I have attached the .dat data file. Would appreciate any guidance/help. Thanks! Cheers, -Ritz http://r.789695.n4.nabble.com/file/n3898622/spdata.dat spdata.dat -- View this message in context: http://r.789695.n4.nabble.com/ARMA-and-prediction-tp3898622p3898622.html Sent from the R help mailing list archive at Nabble.com.